I'm not a fan of roof racks (well, if they have to be permanently attached) - because they look ugly and when you load tents etc and drive at 100ks, the fabrics can tear (i've seen tarps get torn to shreds just because of the wind velocity).

Don't really want to tow the stuff, it's light. Can't really fit it in the boot with all the other crap that needs to come (like air mattresses, the big esky).

I know this might be a bit late but I just took a interstate road trip for almost 4 weeks over 10,000km and we just used onsite cabins and motels. Also stayed with some relatives along the way, easy way for a free bed and meal. We were planning to take a tent and stuff as backup but didn't bother. Depending on how many people you need to support maybe a roof top pod but they cost a bit, but probably cheaper than a trailer.

Really depends if the aim is to go camping or if the camping is just a place to stay along the way.

BTW we also took a couple of blow up mattresses, picnic basket, a small esky and some basic bedding, which came in handy on cold nights. take what you need but not too much.